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(!) (BEST PRICE) 50C5 Mixed US Brands, Canada, Japan used/good (4 for $29.99)
(!) (Best Single) 12DQ6B RCA NOS 1964 (84.5ma)
(!) (Best Single) 12DQ6B RCA NOS 1970's (82ma)
(!) (Best Single) 2A5 RCA by Sylvania NOS 1947 (89/50)
(!) (Best Single) 2A5 RCA NOS 1940's (93/50)
(!) (Best Single) 6AQ5A Sylvania black plate NOS 1970 era (57ma)
(!) (BEST SINGLE) 6DQ5 Sylvania NOS 1960's (135ma)
(!) (Best Single) 6DQ6B RCA NOS 1970's (120ma)
(!) (BEST SINGLE) 6HF5 Sylvania NOS 1970 era (117.5ma)
(!) (Best Single) 6JT6A Sylvania tipped top NOS 1970 era (93ma)
(!) (Best Single) 6V6GT Tungsol gray plate coated glass NOS 1951-1956 (64ma)
(!) (Best Single) 6ZY5G Philco NOS 1940's (53/40 and 54/40)
(!) (Best Single) 7408=6V6GT Sylvania branded Amperex NOS 1974 (41.5ma) (rare)
(!) (Best Single) EL84 Siemens Halske Germany NOS 1972 (54.5ma)
(!) (BEST SINGLE) JAN-CDZ-811 Electronic Enterprises by RCA NOS 1954 (62/36)
(!) (BEST VALUE PAIR) EL84 Brimar England NOS 1962 (67ma and 66ma) (recommended for FIXED-BIAS amp only due to high current)
(!) (Best Value Pair) US Navy-CNU-1626 National Union NOS 1940's (30ma and 32.5ma)
(!) (Best Value Single) 6L6GC Sylvania NOS 1960's internals tilted (95ma)
(!) (Best Value used) 5998 Tungsol branded IBM black plates used/good 1961 very small rattle inside base (68ma/67ma)
(!) (BEST VALUE) EL34 Philips Holland brown base used/good 1960 era (95.5ma)